Heat-exchanging apparatus



Filed May 16, 1928 Patented" Oct. :1, 1929 UNITED STATES arent-. OFFICEJAJuns M. HARRISON, or cnnvnnann, OHIO nnar-nxcnanem'e arrn'aarusApplication filed May 18,

' a manner that the cost of manufacture will a be lower than that ofcorresponding units heretofore used and which will be also adapted formanufacture in various sizes by assembling varying numbers of similarelements. a In the accompanying drawings I have illus- 1 trated a heatexchangmg unit embodying my invention. In these drawings Fig. 1 is aside elevation with certainparts broken away and other parts shown insection. an view with one the line Fig. 2 isa fragmentary pl of theelements shown in section on 2-2 of Fig.1.

Fig. 3 is a view'of the arts shown in Fig. 1, as seen from the left 0Fig; 1; and

Fig. 4.is a perspective view of the section. Referring to the drawings,10 indicates a series of heatexchangin'g elements that are similar inconstruction and size and adapted "to be assembled in parallel relationto form a complete heat exchanging unit.v Each of the elements 10. ismade from sheet metal, and

preferablyof steel, and, where the elements are not too large, the sidesmay be formed of a single sheet with a bend 11 along one edge. The threeopen edges of the element are closed by the insertion of metal strips orbars 12, 13 and 121, these strips or bars bein welded in place .orsecuredin any other suita' is man-; ner. The ends of the bars 13' and 14are spaced a short distance away, from the bars 12 to provide openings15 and 16. through which the interior of the elements maycommunicatewith the headers 17 and 18. The difierent elements may be spaced apartby blocks 19 which are preferably arranged at the corners of theelements, as best shown in Fig. 4, to provide space for air to circulatebetween the elements. The blocks 19 may be welded in position and theheaders 17 and 18 may be of any desired shape but I prefer to ma e themof circular cross section withone side 1928. Serial no. 278,199.

cutlaway to permit the headers to span the openings 15 and 16. Theheaders are preferably welded to' the assembled elements, as indicatedat 20, and should also be weldedto the spacing blocks 19 so that therewill be no leakage from the headers to the space between the variouselements.

' The elements are preferably made thin so as to provide a maximumamount of heat exchanging surfacein a given volume and, in m practice,.lprefer to use bars 12, 13 and 14 that are about square in cross section'and the blocks 19 may be about $4 wide so as to have a space of 4between the difi'erent elements. In order to reinforce the sides of theelements to enable them to resist any internal or external pressure, Iprovide :aseries of depressions 21 in the sides of the elements, insuitable spaced arrangement, these depressions, in the opposite sides ofthe to elements, being in registration and preferably spot-welded orotherwise, secured together.

Heat exchanging units, made up as above described, may comprise anydesired number I of elements'and the headers 17 and 18 will be made therequired length depending upon the number of elements assembled-into asingle unit. The headers of the difierent. units may be secured togetherby means of the flanges 22 provided thereonand these flan es may alsoserve as means for connectingt e pipes I of the s stem with whichtheunits are connected. It will be understood that the units willbeenclosed in a suitable casing'but the same has not been shown in' thedrawings because it" forms no part of the present inven-" tion.

Having thus described my invention, what I claim is: a 1. A heatexchanger comprising a plurality of elements each of which consists oftwo sheet metal side plates secured together along their. edges, spacersbetween said elements, inlet and discharge headers extendingtransversely of said elements and welded to the ed es thereof, and theedges of the elements having openings into said headers. 2. A heatexchanger'comprising a plurality of elements each of which consists oftwo substantially parallel sheet metal side plates spaced apart along aplurality of their edges and havin filler strlps between such edges andsecure thereto, spacers between said elements, inlet and dischargeheaders extend- 5 ing transversely of said elements and welded to theedges thereof and to said spacers, and the edges of the elements havingopenings into said headers. v

3. A heat xchanger comprising a plurality of elements each of whichconsists of two substantially parallel sheet metal side plates spacedapart along a plurality of their edges and havlng filler strips betweensuch edges and welded in position, spacers welded in positionibetweensaid elements adjacent a. plurality of corners thereof, inlet anddischarge headers extending transversely of said elements and welded tothe edges thereof andto said spacers, the edges of said elements havingopenings into said headers,'and the sides of sa1d elements being securedtogether at spaced points remote from the edges of the sections toreinforce the sections against inv ternal pressure therein.

In'testimony whereof, I hereunto aflix my signature.

' JAMES M. HARRISON.

